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    • 1. 发明授权
    • Scan time reduction using conjugate symmetry and recalled echo
    • 使用共轭对称和召回回波进行扫描时间减少
    • US4833407A
    • 1989-05-23
    • US124040
    • 1987-11-23
    • G. Neil HollandTerrence J. ProvostGordon D. DeMeesterKenneth S. Denison
    • G. Neil HollandTerrence J. ProvostGordon D. DeMeesterKenneth S. Denison
    • A61B10/00A61B5/055G01R33/44G01R33/48G01R33/50G01R33/54G01R33/56G01R33/561
    • G01R33/56G01R33/561G01R33/5602
    • A spin echo (52) and a gradient echo (60) are generated in each magnetic resonance sequence repetition. The spin echo is phase encoded by a phase encode gradient (44) in regular steps spanning about a quarter of k-space. More particularly, steps from -n to G.sub.max /2, where n is a small integer and G.sub.max is the maximum phase encode gradient. An off-set phase encode gradient (58) shifts the phase encoding of the gradient echo by G.sub.max /2 relative to the first phase encoding gradient. Data to fill the empty portions of k-space (142, 167) between -n and -G.sub.max are generated from the complex conjugate (140, 160), of the first echo data (74) and the second echo data (76). The first and second echo data and the complex conjugate data are transformed (122, 132, 146, 166) to generate parted image representations (124, 134, 148, 168). The first echo image representation and the corresponding conjugately symmetric image representation are phase corrected (126, 150) in accordance with a phase map ( 112) derived from the central most first echo data (78). The partial image representations are summed (170) to produce a resultant image representation (172).
    • 在每个磁共振序列重复中产生自旋回波(52)和梯度回波(60)。 自旋回波由相位编码梯度(44)进行相位编码,其规则步长约为四分之一的k空间。 更具体地,从-n到Gmax / 2的步骤,其中n是小整数,Gmax是最大相位编码梯度。 偏移相位编码梯度(58)相对于第一相位编码梯度将梯度回波的相位编码移位Gmax / 2。 从第一回波数据(74)和第二回波数据(76)的复共轭(140,160)生成-n和-Gmax之间的填充k空间(142,167)的空部分的数据。 第一和第二回波数据和复共轭数据被变换(122,132,146,166)以产生分离的图像表示(124,134,148,168)。 根据从中央最初回波数据(78)得到的相位图(112),第一回波图像表示和对应的共同对称图像表示被相位校正(126,150)。 将部分图像表示相加(170)以产生所得到的图像表示(172)。